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Erdős problem 654

If nn planar points have no four concyclic, must some point determine (1−o(1))n(1 - o(1))n distinct distances? Failing that, can one always force more than (1/3+c)n(1/3 + c)n?

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sha256:32b13d9cb58335ed81391fcb6a824e228672c6e48534aa7b8d71cc6dd0863454
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2415f78e850aeee50afdca525c6f2e0ea606f207
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